/*
 * Copyright (c) 2015 The Jupiter Project
 *
 * Licensed under the Apache License, version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.ferry.common.util;


public final class Pow2 {

    /**
     * 找出大于当前数字 且是2的n次方的最小数字
     * @param value
     * @return
     */
    public static int roundToPowerOfTwo(final int value) {
        return 1 << (32 - Integer.numberOfLeadingZeros(value - 1));
    }

    public static boolean isPowerOfTwo(final int value) {
        return (value & (value - 1)) == 0;
    }

    private Pow2() {}

    public static void main(String[] args) {
        System.out.println(roundToPowerOfTwo(100));
    }
}

